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dc.contributor.authorDusuel, Sébastien
dc.contributor.authorVidal, Julien
dc.contributor.authorArias Carrasco, José Miguel
dc.contributor.authorDukelsky, J.
dc.contributor.authorGarcía Ramos, José Enrique
dc.identifier.citationDusuel, S., Vidal, J., Arias Carrasco, J.M., Dukelsky, J., García Ramos, J. E.: "Continuous unitary transformations in two-level boson systems". Physical Review C. Vol. 72, n. 6 (2005). ISSN 0556-2813
dc.description.abstractTwo-level boson systems displaying a quantum phase transition from a spherical (symmetric) to a deformed (broken) phase are studied. A formalism to diagonalize Hamiltonians with O(2L + 1) symmetry for large number of bosons is worked out. Analytical results beyond the simple mean-field treatment are deduced by using the continuous unitary transformations technique. In this scheme, a 1/N expansion for different observables is proposed and allows one to compute the finite-size scaling exponents at the critical point. Analytical and numerical results are compared and reveal the power of the present approach to compute the finite-size corrections in such a context.en
dc.publisherAmerican Physical Society
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España
dc.subject.otherQuantum phase transitionsen
dc.subject.otherInteracting Boson Modelen
dc.titleContinuous unitary transformations in two-level boson systemsen_US

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